Can't get 8GB to work on X7SBL-LN2

Hi Guys,

When I install 2 pairs of DIMM's (8GB) on the X7SBL-LN2 motherboard the machine will not boot.

When I install ANY pair of these DIMM's in the blue slots (4GB) the machine boots OK.

Obviously the DIMM's are OK, so why won't the machine boot with 2 pairs of DIMM's?

(Before buying the RAM I checked with Kingston's web site to make sure it was compatible with the motherboard.)

Is there a workaround for this? I'd hate to be stuck running 4GB of RAM when I paid for 8GB!

Thanks in advance for any advice you may have.

JD

My setup:
--------------

- Supermicro X7SBL-LN2 motherboard BIOS v1.2a

- 8GB (4 DIMM's) of Kingston RAM DDR2 800 (KVR800D2N6K2/4G )

- Intel Core 2 Quad Q8400 CPU

- Antec EA-380D 380W power supply

Does it never work when you have the RAM in the other slots? Even when you are only using one stick? If so, I'd say update your BIOS, and if that doesn't work, get your motherboard replaced.

Motherboard supports 8 GB? Try running them at 667 MHz rather than 800 (might help).

Boris,

I contacted Supermicro tech support and received the following answers - I'm not sure what to make of them:


From: Supermicro tech support:
======================================


The motherboard supports up to 8GB unbuffered ECC / non-ECC DDR2 800/667 SDRAM in total.

JL

----------------------------------------------------------------------

Please go to:

http://www.supermicro.com/products [...] BL-LN2.cfm

and then click "Tested memory list".

There is no certified 8G memory module.

JL

---------------------------------------------------------------------------

If any set of ram working independently but not working together that mean both memory modules is incompatible.

Please check with Kingston for suggestion or replacement with compatible type.

DL

I am using the C7P67 MB and the many types of RAM's out there don't always work for Supermicro MB, you have to review what they used and followed the same or get the fact sheet of the type of RAM's that do work and find one very close to the same. All the RAM should be the same type, don't mix, and watch the voltage, 1.8v only
I reviewed the Kingston versions and found one that works for mine, 16GB worth, #KHX1333C903B1K2/8G, took some time but works well.
BTW, what OS are you using

JD,
If you found a different speed on Crucial, then I would question what to use with Kingston, I would believe Crucial first.
Most of the time I use Crucial but I took a chance with the new MB using Kingston, the price was just to hard to let go for 16GB worth. Do watch the voltage called out along with Non-ecc or Ecc and channel type, SM is picky

I have seen badly manf MB that were so warp after mounting in the case, things were twisted and connections failed, it happens.
Best thing to do with any new MB is to check the flatness before installing, cause a twisted MB when force to be flat can stress solder joints.
Reason why to worry with the heavy CPU heatsinks and MB's mounted vertical.
Also I check the RAM connector fingers to see if any are not shape correctly, could cause bad connection.
Then I look for cold solder joints, because sometimes during the initial setup for the wave solder machine the solder is not up to temp for the first group of MB's, things happen.